On Tue, 18 Dec 2007, Guy Watkins wrote:

} -----Original Message-----
} From: linux-raid-owner@vger.kernel.org [mailto:linux-raid-
} owner@vger.kernel.org] On Behalf Of Brendan Conoboy
} Sent: Tuesday, December 18, 2007 3:36 PM
} To: Norman Elton
} Cc: linux-raid@vger.kernel.org
} Subject: Re: Raid over 48 disks
}
} Norman Elton wrote:
} > We're investigating the possibility of running Linux (RHEL) on top of
} > Sun's X4500 Thumper box:
} >
} > http://www.sun.com/servers/x64/x4500/
}
} Neat- 6 8 port SATA controllers!  It'll be worth checking to be sure
} each controller has equal bandwidth.  If some controllers are on slower
} buses than others you may want to consider that and balance the md
} device layout.

Assuming the 6 controllers are equal, I would make 3 16 disk RAID6 arrays
using 2 disks from each controller.  That way any 1 controller can fail and
your system will still be running.  6 disks will be used for redundancy.

Or 6 8 disk RAID6 arrays using 1 disk from each controller).  That way any 2
controllers can fail and your system will still be running.  12 disks will
be used for redundancy.  Might be too excessive!

Combine them into a RAID0 array.

Guy

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I'd be curious what the maximum aggregate bandwidth would be with RAID 0 
of 48 disks on that controller..